Subsystems can be defined in the
file using the following syntax.
argument is the command which will be executed when the subsystem is requested.
$ ssh2 user@remote -s <name>
argument can be a list of commands separated with a semicolon (
;), or it can, for example, refer to a script.
One example of a subsystem is
sftp subsystem also has an internal alternative. This should be used for example when the user is chrooted and does not have access to the